A two-dimensional numerical simulation, via a finite difference method, of fluid flow and heat transfer in a rectangular natural circulation loop is presented to explore efficacy of using solid-liquid phase change material (PCM) suspensions as a heat transfer medium. A continuum mixture flow model is used for the buoyancy-driven circulation flow of the PCM suspensions together with an approximate enthalpy model to describe the solid-liquid phase change (melting/freezing) process of the PCM particles in the loop. Parametric simulations have been conducted for the pertinent physical parameters of a loop with fixed geometrical configuration in the following ranges: the modified Rayleigh number Ra* = 109 ∼ 1013, the modified Stefan number Ste* = 0.05 ∼ 0.5, the particle volumetric fraction cv = 0 ∼ 20%, and the modified subcooling factor Sb* = 0-2.0. The melting/freezing processes of the PCM particles at the heated/cooled sections of the loop are closely interrelated in their inlet conditions of the suspension. Closer examination of numerical results reveals that there could be a flow regime in the parametric domain where heat transfer performance of the suspension circulation loop is significantly enhanced, due to contribution of the latent heat transport associated with melting/freezing of PCM particles.
|Number of pages||10|
|Publication status||Published - 2004 Jan 1|
|Event||2004 ASME Heat Transfer/Fluids Engineering Summer Conference, HT/FED 2004 - Charlotte, NC, United States|
Duration: 2004 Jul 11 → 2004 Jul 15
|Other||2004 ASME Heat Transfer/Fluids Engineering Summer Conference, HT/FED 2004|
|Period||04-07-11 → 04-07-15|
All Science Journal Classification (ASJC) codes